A reflex test of the knee is the basis for the term knee-jerk reaction.. A knee-jerk reaction is typically impulsive in nature and doesn't allow for someone to think things through. An outburst of anger is an example of a knee-jerk reaction.
As Figure 1 shows, the central processing unit consists of two parts: The control unit and the arithmetic/logic unit. Each part has a specific function. Before we discuss the control unit and the arithmetic/logic unit in detail, we need to consider data storage and its relationship to the central processing unit.
n A digital data processing subsystem comprised of redundant central processor units plus companion input/output units, resident software, digital data buses, and numerous remote bus terminal units would function as the core subsystem to interconnect all avionics subsystems. It also provided the means for the crew and ground to access all vehicle systems (i.e., avionics and non-avionics systems). There were exceptions to this, such as the landing gear, which was lowered by the crew via direct hardwired switches. Engineering Innovations 243